Answer:
Love lasts when life is good, but friendship lasts even when life is difficult.
Step-by-step explanation:
The poem compares love with the wild rose-briar and friendship with holly-tree. In this comparison, the author shows how the wild rose-briar has its best moment in summer and spring that are pleasant moments where everything is beautiful and admirable, but winter is cruel to the rosebush that does not resist this adverse moment, unlike the holly-tree, which is strong and beautiful during any situation. By this, the author means that Love is fragile as the wild rose-briar, and will only last when life is good, but friendship lasts even when life is difficult.